<!DOCTYPE HTML>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/elementsFromPoint.js"></script>
<style>
html {
    overflow-y: scroll;
    overflow-x: scroll;
}
html, body {
    margin: 0;
    padding: 0;
}
body {
    width: 100%;
    height: 100%;
}
#simpleDiv {
    width: 200px;
    height: 200px;
    background-color: rgba(0,255,0,0.5);
}
#beyondTopLeft {
    position: absolute;
    transform: translate3d(-100px, -100px, 10px);
    left: 0;
    top: 0;
    width: 100px;
    height: 100px;
    background-color: rgba(0,0,0,0.1);
}
</style>
<body>
<div id="beyondTopLeft"></div>
<div id="simpleDiv"></div>
<script>
test(function() {
    assertElementsFromPoint('document', 300, 300, [document.documentElement]);
}, "The root element is the last element returned for otherwise empty queries within the viewport");

test(function() {
    var simpleDiv = document.getElementById('simpleDiv');
    var simpleRect = simpleDiv.getBoundingClientRect();
    var simpleCoords = (simpleRect.right - 1) + ', ' + (simpleRect.bottom - 1);
    assertElementsFromPoint('document', simpleRect.right - 1, simpleRect.bottom - 1,
        [simpleDiv, document.body, document.documentElement]);
}, "The root element is the last element returned for valid queries");

test(function() {
    assertElementsFromPoint('document', window.innerWidth + 1, window.innerHeight + 1, []);
    assertElementsFromPoint('document', -1, -1, []);
    assertElementsFromPoint('document', 1, -1, []);
    assertElementsFromPoint('document', -1, 1, []);
}, "An empty sequence is returned for queries outside the viewport");
</script>
</body>